From the answer:
This is QuickBooks’ recommended solution for this scenario.... Editor’s Note: Title changed from “New sales tax rate does not apply to existing sales orders in Point of Sale” to “How to Apply New Sales Tax rate to Existing Sales Orders in QuickBooks Poin

From the answer:
This is QuickBooks’ recommended solution for this scenario.... Editor’s Note: Title changed from “Unable to customize columns on the Sales Order List details screen” to “How to Customize Columns on Sales Orders in QuickBooks Point of Sale” on 6/10/19.

From the answer:
This is QuickBooks' recommended solution for this scenario.... Editor’s Note: Title changed from “Create fee items for use on receipts in POS” to “How to Setup Fees on Receipts in QuickBooks Point of Sale (POS)” on 6/10/19.

From the answer:
POS Supports Price Levels, not per customer pricing.... So if Price Level 2 has PriceA (the discount) for the item you have in mind and a customer is set to that price level it will sell it to them at that discounted price.